/Engine/Source/Editor/UnrealEd/Public/EditorWorldExtension.h
Gets the editor world wrapper that is found with the world passed. Adds one for this world if there was non found.
[UEditorWorldExtensionCollection](API\Editor\UnrealEd\UEditorWorldExtensionCollection) * GetEditorWorldExtensions ( [UWorld](API\Runtime\Engine\Engine\UWorld) * InWorld, const bool bCreateIfNeeded )